More that 10 years ago I bought a guitar and a Mesa Boogie F30 in order to start learning guitar but it didn't happen... until now. I have bought headphones to quietly practice, Audio Technica ATH-M20X, but when I hit the mute speaker switch on the back of the amp with the headphones connected there is still a low volume sound coming out of the cabinet... and that defeats the purpose of using headphones. So the question is: can I disconnect the cabinet when the mute speaker switch is on mute setting or will that damage my amp ? Must I always have a cabinet connected no matter what ?